Binary Toxin Genes Overcoming Pest Resistance

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Solution Overview

Problem

The widespread resistance of pests to Bacillus thuringiensis (Bt) toxins in transgenic crops necessitates the development of new insecticidal proteins with different modes of action to maintain effective pest control in agricultural settings.

Innovation Solution

The use of isolated nucleic acid sequences encoding proteins with specific identities, forming Group 1 and Group 2 proteins, which combine to create a binary toxin effective against insect pests like Diabrotica virgifera virgifera larvae, expressed in transgenic plants to enhance pest resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If Bacillus thuringiensis (Bt) toxins are used in transgenic crops, then pest control effectiveness is improved, but pest resistance to Bt toxins develops over time

Engineering Contradiction:

Improvepest control effectivenessVSAvoidpest resistance

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent divides the pest control function into two separate protein components (Group 1 and Group 2 proteins) that work together as a binary toxin system. This segmentation allows each component to have a distinct mode of action, making it harder for pests to develop resistance compared to single-toxin Bt systems.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a composite pesticidal system by combining Group 1 and Group 2 proteins into a binary toxin formulation. This composite approach integrates two different toxin mechanisms, providing synergistic or additive pest control effects while reducing the risk of resistance development.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If new toxin proteins are discovered from sources other than B. thuringiensis, then alternative modes of action are obtained, but the complexity of finding and validating new toxins increases

Engineering Contradiction:

Improvemode of action diversityVSAvoidtoxin discovery complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent uses bioinformatics tools and sequence homology analysis as intermediaries to identify and validate new toxin proteins from non-B. thuringiensis sources. This intermediary approach systematically filters and evaluates potential toxins, reducing the complexity of the discovery process while maintaining diversity in modes of action.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If insecticidal genes are stacked in transgenic plants, then resistance to Bt toxins is overcome, but the complexity of the genetic system increases

Engineering Contradiction:

Improveresistance managementVSAvoidgenetic system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the functions of multiple insecticidal genes into a coordinated binary toxin expression system. Rather than independently stacking multiple Bt toxin genes, the patent combines Group 1 and Group 2 proteins that work together, simplifying the genetic architecture while achieving resistance management goals.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12252514B2Pesticidal genes and methods of use

Publication Date: 2025.03.18 GENECTIVE SA

AI summary

The invention relates to the field of molecular biology and particularly novel genes that encode pesticidal proteins useful for controlling pests, particularly plant pests. These proteins and the nucleic acid sequences that encode them are useful in preparing pesticidal compositions and in the production of transgenic pest-resistant plants.